2025 Compare Climate & Weather:
Portersville, PA vs Mercer, PA

Highlights

On average, there are 158 sunny days per year in Mercer. Portersville averages 160 sunny days per year. The US average is 205 sunny days.

Mercer, Pennsylvania gets 42.3 inches of rain, on average, per year. Portersville, Pennsylvania gets 41.7 inches of rain, on average, per year. The US average is 38.1 inches of rain per year.

Mercer averages 44.5 inches of snow per year. Portersville averages 34.6 inches of snow per year. The US average is 27.8 inches of snow per year.

Weather Highlights

Mercer, Pennsylvania
Summer High: the July high is around 82.2 degrees
Winter Low: the January low is 16.5
Rain: averages 42.3 inches of rain a year
Snow: averages 44.5 inches of snow a year

Portersville, Pennsylvania
Summer High: the July high is around 82.9 degrees
Winter Low: the January low is 18.3
Rain: averages 41.7 inches of rain a year
Snow: averages 34.6 inches of snow a year

BestPlaces Comfort Index

The annual BestPlaces Comfort Index for Mercer borough is 6.7 (10=best), which means it is less comfortable than most places in Pennsylvania.

The annual BestPlaces Comfort Index for Portersville is 6.8 (10=best), which means it is less comfortable than most places in Pennsylvania.

Today's Weather - Portersville, PA

52°F

Today's Weather - Mercer, PA

52°F

Average Monthly High / Low (°F)

Hot, Freezing, Rainy, Snowy Days: Portersville / Mercer

July is the hottest month for Portersville with an average high temperature of 82.9°, which ranks it as about average compared to other places in Pennsylvania. In Portersville, there are 5 comfortable months with high temperatures in the range of 70-85°. The most pleasant months of the year for Portersville are June, September and August.

July is the hottest month for Mercer borough with an average high temperature of 82.2°, which ranks it as cooler than most places in Pennsylvania. In Mercer borough, there are 4 comfortable months with high temperatures in the range of 70-85°. The most pleasant months of the year for Mercer borough are June, August and September.

January has the coldest nighttime temperatures for Portersville with an average of 18.3°. This is colder than most places in Pennsylvania.

January has the coldest nighttime temperatures for Mercer borough with an average of 16.5°. This is colder than most places in Pennsylvania.

In Portersville, there are 8.5 days annually when the high temperature is over 90°, which is about average compared to other places in Pennsylvania.

In Mercer borough, there are 6.5 days annually when the high temperature is over 90°, which is cooler than most places in Pennsylvania.

In Portersville, there are 133.8 days annually when the nighttime low temperature falls below freezing, which is colder than most places in Pennsylvania.

In Mercer borough, there are 143.6 days annually when the nighttime low temperature falls below freezing, which is colder than most places in Pennsylvania.

In Portersville, there are 5.0 days annually when the nighttime low temperature falls below zero°, which is colder than most places in Pennsylvania.

In Mercer borough, there are 7.1 days annually when the nighttime low temperature falls below zero°, which is one of the coldest places in Pennsylvania.

July is the wettest month in Portersville with 4.4 inches of rain, and the driest month is February with 2.3 inches. The wettest season is Autumn with 30% of yearly precipitation and 20% occurs in Spring, which is the driest season. The annual rainfall of 41.7 inches in Portersville means that it is drier than most places in Pennsylvania.


June is the wettest month in Mercer borough with 4.5 inches of rain, and the driest month is February with 2.2 inches. The wettest season is Autumn with 30% of yearly precipitation and 19% occurs in Spring, which is the driest season. The annual rainfall of 42.3 inches in Mercer borough means that it is about average compared to other places in Pennsylvania.

January is the rainiest month in Portersville with 16.1 days of rain, and August is the driest month with only 10.5 rainy days. There are 158.0 rainy days annually in Portersville, which is rainier than most places in Pennsylvania. The rainiest season is Spring when it rains 28% of the time and the driest is Autumn with only a 22% chance of a rainy day.

January is the rainiest month in Mercer borough with 15.3 days of rain, and August is the driest month with only 10.3 rainy days. There are 155.7 rainy days annually in Mercer borough, which is rainier than most places in Pennsylvania. The rainiest season is Spring when it rains 28% of the time and the driest is Autumn with only a 22% chance of a rainy day.

An annual snowfall of 34.6 inches in Portersville means that it is snowier than most places in Pennsylvania.

An annual snowfall of 44.5 inches in Mercer borough means that it is snowier than most places in Pennsylvania.

January is the snowiest month in Portersville with 11.4 inches of snow, and 6 months of the year have significant snowfall.

January is the snowiest month in Mercer borough with 12.6 inches of snow, and 6 months of the year have significant snowfall.